SIL3 Power supply unit "PSx1200 Series"

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last updated：Jun 15, 2026

GMI Japan KK

SIL 3 certified, 24 Vdc modular power supply suitable for installation in safe area and Zone/division 2. designed for 100% availability and high Integrity applications; built-in load sharing in both DIN-rail and rack mounted solutions

The "PSx1200 series" is an explosion-proof power supply unit designed to guarantee an output voltage of 20-30Vdc under both normal and fault conditions. It is certified with SIL3 functional safety level, and the 24Vdc redundant power supply can be installed and used in safe and Zone 2 (Class II hazardous locations) areas. Additionally, it incorporates Ideal OR-ing diode technology and load sharing circuits. 【Features】 ■Smaller foot print: very compact design ■Flexibility: wall/rack/DIN-rail types ■Environmental condition: extended temperature range (-40°C ～ +70°C), G3 coating, tested for marine application(EMC, vibration, etc.) ■Zone 2 installation: reduced cable distance ■Improved safety, integrity and reliability: SIL 3 certified by third party ■High efficiency - reduced bulk power & dissipation: builtin intelligent load sharing ■Easier Installation: no external OR-ing diodes needed for redundancy ■Zero Downtime: built-in redundancy, operation under output short-circuit condition, automatic load sharing of 2 or more modules ■Reduced maintenance cost: hot swapping, also in zone 2 (PSS1250) ■Guaranteed fault isolation: short circuit protection ■Easier troubleshooting: local and remote (optional Modbus) diagnostic *For more details, please download the PDF or feel free to contact us.

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basic information

【Other Features】 Reasons for SIL 3 Power Supply [SIL 3 Power Supply] During normal operation, output voltage is considered safe between 20 and 30 vdc and safe state is typically when the output voltage is 0 vdc; or close to it. However, all power supplies can fail in conditions different from zero; leading to a dangerous state that can damage or put the load in an unstable/unsafe condition: fail high (above 30 vdc) or fail low (between 2 vdc and 20 vdc). According to the ‘normative section’ of the IEC61508:2010 part 2 - Annex A - table A.9, the global objective is to detect or tolerate both under-voltage and/or over-voltage and maintain your safety instrumented functions (SIF) in the normal operating range. Both failures can potentially lead to a hazardous situation, either damaging the instruments by overvoltage or not providing the necessary voltage for normal functioning of the instrument/device. The majority of the SIF are working on the de-energise to trip principle where the main concern is availability of the power and is solved with redundancy. However, redundancy is not the solution for high or low voltage failures. Special notice should be given to energized to trip sif where any failure of the power supply will put safety at risk. GM International power supplies are designed and certified to guarantee an output voltage of 20-30 Vdc under normal and fault conditions. [Safety Function] ■Keep the output power within the safe range from 20Vdc to 30Vdc. ■Prevent abnormal and dangerous conditions like:2Vdc < Output Voltage <20Vdc Output Voltage > 30Vdc [Reasons for Ideal OR-ing Diode] High availability systems employ power supply modules connected in parallel to achieve redundancy and enhance system reliability; typically using a OR-ing Diode. OR-ing diodes introduce a significant voltage drop and will not equalize the load (load sharing). Because of the high dissipated heat, they are often the cause of failure. GM International power supply system makes use of Ideal diode technology and load sharing circuitry. *For more details, please download the PDF or feel free to contact us.